Thanks to all who replied to my original post. Results are in:
1. Alternator belt is tight. Star nut is OK.
2. Radiator fan is fine. Still, I wish it didn't draw 42 amps.
3. Best guess, by my mechanic, who is an old world ace: fluctating idle (750
rpm, approx.) was too low to handle the load. Expains why it didn't happen
while driving. Also, a couple of days later, same conditions, higher
rpm(950) no problem.
It's more than a car, it's a GREAT hobby.
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